Blue Monday
Blue Monday is held on January 20. Date for 2025. The third Monday is claimed to be the most depressing day of the year. This event in the second decade of the month January is annual. 
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The name was reportedly coined by psychologist Cliff Arnall in 2004, it falls on the third Monday in January every year. This has been disputed by others over the years. He came up with it after a holiday company asked him for a "scientific formula" for the January blues (the sadness that comes with this period).
In general Blue Monday is considered part of pseudoscience. All in all, it is considered fake and scientists don’t accept it as real.
Cliff Arnall talked about Blue Monday in the Independent in 2018. Many companies adopted the idea of Blue Monday and created campaigns based on its concept.
Similar holidays and events, festivals and interesting facts
Tin Can Day on January 19 (Peter Durand patented the tin can in 1810);
Camcorder Day on January 20 (On this date in 1982, the camcorder was first introduced into the public marketplace by Sony Electronics);
National Answer Your Cats Questions Day on January 22
Celebration Of Life Day on January 22
Handwriting Day on January 23 (The day was basically started by the Writing Instrument Manufacturers Association in 1977);
Measure Your Feet Day on January 23
Beer Can Appreciation Day on January 24 (This tradition was first started in 1935, and on the heels of it came a never ending parade of varieties of labelling);
Global Belly Laugh Day on January 24
Compliment Day on January 24
Talk Like A Grizzled Prospector Day on January 24
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